feat: 초기 프로젝트 설정 및 룰.md 파일 추가

api.hyungi.net/node_modules/@simplewebauthn/server/esm/helpers/parseBackupFlags.js

@@ -0,0 +1,25 @@
+/**
+ * Make sense of Bits 3 and 4 in authenticator indicating:
+ *
+ * - Whether the credential can be used on multiple devices
+ * - Whether the credential is backed up or not
+ *
+ * Invalid configurations will raise an `Error`
+ */
+export function parseBackupFlags({ be, bs }) {
+    const credentialBackedUp = bs;
+    let credentialDeviceType = 'singleDevice';
+    if (be) {
+        credentialDeviceType = 'multiDevice';
+    }
+    if (credentialDeviceType === 'singleDevice' && credentialBackedUp) {
+        throw new InvalidBackupFlags('Single-device credential indicated that it was backed up, which should be impossible.');
+    }
+    return { credentialDeviceType, credentialBackedUp };
+}
+export class InvalidBackupFlags extends Error {
+    constructor(message) {
+        super(message);
+        this.name = 'InvalidBackupFlags';
+    }
+}